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R EGISTRY E LEMENT S UPPORTS : Tracking emissions attributes for every MWh generated Allocation of emission liabilities for purchased power Calculation of average and residual system emission rates Allocation of emission liabilities for purchased power Applying emission attribute to imported and exported power Tracking Energy Efficiency savings The inclusion of energy efficiency certificates in tradable markets Calculation and tracking of emission reductions from RE & EE The inclusion of energy efficiency and renewable energy to adjust emission rates Tagging emission attributes from source to sink Interaction with other regional power markets and the attribution of emission characteristics to power imports and exports Tracking inter-state power transactions The ability to set-up a state market that does not align with regional power market borders Inter-registry Import and Exports Guarantees that attributes are not double-counted between regions Support carbon allowance adjustment based on voluntary green power Enables allowance adjustments whether for green power markets or RPS compliance results Public ReportsProvides transparency to all stakeholders

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Implementation Scenarios

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Interstate Trading Solutions OptionAdvantagesDisadvantages Structure regional programs that correspond to power region boundaries Simplifies accounting and power market transactions Not necessarily a feasible option for most states as they are participating in more than one region Rely on GHG restrictions being implemented equally across States Does not reflect physical power flows which could contribute to other issues States could implement rules on varying timetables providing unequal market conditions Track intra-region transactions and match with attributes Most accurate accounting as the attributes reflect the physical transactions Requires work to better understand and compute intra-region power flows Rely on all generation tracking for emissions liabilities and performance If all states within a power region follow this approach all emission liabilities will be accounted for Some states participate in more than one power region